A common cause of confusion for new users (who have just setup Matomo, or created a new website), is that by default Matomo shows Yesterday's data. And people often don't realise they should look at Today's to see their data. So it would be valuable to guide new users and help them understand they're looking at the wrong date (small improvement to onboarding).
What do you think?
I'm pretty sure I've suggested somewhere before to select "today" automatically when eg no data has been tracked yet, or only started tracking on that day etc.